Huge thanks for introducing me to hg_sdf! It's just what I need for my project [0]. I found few similar resources ([1],[2]), but this is vastly more useful.

[0] https://github.com/jmiskovic/arbo

[1] http://jamie-wong.com/2016/07/15/ray-marching-signed-distanc...

[2] https://www.scratchapixel.com/lessons/advanced-rendering/ren...